Season 3 opens with Kara dealing with the loss on Mon-El by focusing her energy on being Supergirl and concentrating on a mysterious new threat; Alex confessing a secret to Maggie; a citizen of National City having a mysterious connection to Kara; Lena making a bold move.

Janey Briggs is an aspiring artist who is outcast by her classmates for wearing glasses, a ponytail and paint-covered overalls. The popular jock, Jake, takes a bet that he can transform Janey, into the prom queen before the prom. But he has roadblocks, to be exact, two.